Method in a Belt Reeler and a Belt Reeler

ABSTRACT

A belt reeler has a reeling nip ( 7 ) formed by a reeling core ( 6 ) or a growing machine reel ( 4 ) and at least one endless supporting member ( 3 ) traveling at least via a first wire guiding roll ( 1 ), and a second wire guiding roll ( 2 ). Several parameters of the belt reeler are adjusted simultaneously to adjust the reeling process, of which parameters at least the first parameter and the second parameter are one of the following: web tension (P 1 ), wire tension (P 2 ), distance of the machine reel from the wire turning roll (P 3 ), depression of the wire/machine reel (P 4 ), surface draw (P 5 , P 5 ′, P 5 ″), and peripheral force (P 6 ).

CROSS REFERENCES TO RELATED APPLICATIONS

This application claims priority on Finnish Application No. 20055397,Filed Jul. 8, 2005, the disclosure of which is incorporated by referenceherein.

STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSOREDRESEARCH AND DEVELOPMENT

Not applicable.

BACKGROUND OF THE INVENTION

The invention relates to a method for controlling a belt reeler. Theinvention also relates to a belt reeler. In addition, the inventionrelates to a method for rebuilding a center-driven reeler, and a reelingapparatus, as well as a reel change method.

In the final end of a machine manufacturing paper, paperboard, softtissue or the like or a finishing apparatus for paper, paperboard orsoft tissue or the like, a paper web which is typically several meterswide and which has been produced and/or treated in the preceding machinesections, is reeled around a reeling core, i.e. a reel spool to form amachine reel. In this reeling up process a reeling cylinder that isbearing-mounted rotatable is typically used for guiding the paper web onthe machine reel, wherein the nip contact between the reeling cylinderand the machine reel is utilized to influence the quality of the reelproduced thereby. The ends of the reel spool are affected by means of asuitable loading mechanism to adjust the nip contact between the machinereel that is being formed and the reeling cylinder. Such reelingconcepts and loading methods related thereto are disclosed, for example,in the Finnish patent 91383 and in the corresponding U.S. Pat. No.5,251,835, as well as in the Finnish patent application 950274 and inthe corresponding U.S. Pat. No. 5,690,298.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to disclose a method thatenables the formation of different kinds of reels with a belt reeler.

To attain this purpose, the method according to the invention isprimarily characterized in that in the method several parameters aredetermined and adjusted simultaneously to adjust the reeling process, ofwhich parameters at least the first parameter and the second parameterare one of the following: web tension, wire tension, distance of themachine reel from the wire turning roll, depression of the wire/machinereel, surface draw, and peripheral force. The belt reeler according tothe invention, in turn, is primarily characterized in that the beltreeler comprises at least means for determining and adjusting severalparameters simultaneously to adjust the reeling process, of whichparameters at least the first parameter and the second parameter are oneof the following: web tension, wire tension, distance of the machinereel from the wire turning roll, depression of the wire/machine reel,surface draw, peripheral force. The method according to the inventionfor rebuilding a reeler is primarily characterized in that thecenter-driven reeler is formed into a belt reeler by replacing itsreeling cylinder with a first wire guiding roll and adding at least asecond wire guiding roll, and an endless supporting member. The reelingapparatus according to the invention is primarily characterized in thatthe reeling apparatus comprises at least a belt reeler in which areeling nip is formed by a reeling core or a growing machine reel and atleast one endless supporting member arranged to travel at least via afirst wire guiding roll and a second wire guiding roll, and the beltreeler comprises at least two stationary reeling stations to form amachine reel. The reel change method according to the invention isprimarily characterized in that a reeling nip is formed by a reelingcore or a growing machine reel and at least one endless supportingmember traveling at least via a first wire guiding roll and a secondwire guiding roll, wherein the reeling core is provided with an adhesiveelement located in such an area in the reeling core which at least inthe beginning of the reeling process remains outside the reeling nip, towhich adhesive element a section of the paper web is guided whenchanging the reeling core.

Herein, a method is disclosed to be utilized in a belt reeler in which areeling nip is formed by a reeling core or a growing machine reel and atleast one endless supporting member traveling at least via a first wireguiding roll, and a second wire guiding roll. In the method severalparameters are adjusted simultaneously to adjust the reeling process, ofwhich parameters at least the first parameter and the second parameterare one of the following: web tension, wire tension, distance of themachine reel from the wire turning roll, depression of the wire/machinereel, surface draw, peripheral force. It is also possible that several,such as three, four, five or six of the parameters are those listedabove. In some embodiments a parameter is determined by means ofmeasurements or calculations.

Correspondingly, a belt reeler in which a reeling nip is formed by areeling core or a growing machine reel and at least one endlesssupporting member arranged to travel at least via a first wire guidingroll and a second wire guiding roll, comprises at least means fordetermining and adjusting several parameters simultaneously to adjustthe reeling process, of which parameters at least the first parameterand the second parameter are one of the following: web tension, wiretension, distance of the machine reel from the wire turning roll,depression of the wire/machine reel, surface draw, peripheral force.

In one embodiment the belt reeler is formed of a center-driven reeler byreplacing its reeling cylinder with a first wire guiding roll and addingat least a second wire guiding roll and an endless supporting member. Inthis context, the term center drive refers to a driving means arrangedin one or both ends of the shaft of a growing machine reel, especiallyto an electric drive typically equipped with a gearbox. With the conceptcenter-driven reeler reference is made to a reeler known from the stateof the art, in which the reeling core and the growing machine reel areequipped with a center drive.

In one embodiment the belt reeler is arranged in a reeling apparatuscomprising at least two stationary reeling stations to form a machinereel. In a preferred embodiment the first wire guiding roll and thesecond wire guiding roll are arranged to move in relation to the reelingstations.

In an embodiment, the area of the reeling core outside the paper web isprovided with an adhesive element against which a section of the paperweb is guided when changing the reeling core.

The center-driven reeler which comprises at least a reeling cylinder,can be rebuilt into a belt reeler in such a manner that the reelingcylinder is replaced with a first wire guiding roll and at least asecond wire guiding roll and an endless supporting member are providedtherein. It is also possible to use an old reeling cylinder or apart/parts thereof, such as roll mantle, bearings, electric drive, etc.as a first wire guiding roll. If necessary, it is possible to modify thesurface of the reeling cylinder, for example by lathing or grinding, sothat it becomes suitable as a wire guiding roll.

The reeling apparatus, in turn, can be formed in such a manner that itcomprises at least a belt reeler, in which the reeling nip is formed ofa reeling core or a growing machine reel and at least one endlesssupporting member that is arranged to travel through at least the firstwire guiding roll and the second wire guiding roll. Furthermore, thereeling apparatus comprises at least two stationary reeling stations toform a machine reel. Advantageously, the first wire guiding roll and thesecond wire guiding roll of the reeling core are arranged to move inrelation to the reeling stations.

The reel change method, in turn, is characterized in that the method isintended to be used in a belt reeler in which a reeling nip is formed bya reeling core or a growing machine reel and at least one endlesssupporting member traveling at least via a first wire guiding roll, anda second wire guiding roll. In the method, the area of the reeling coreoutside the paper web and/or the wire is provided with an adhesiveelement against which a section of the paper web is guided when changingthe reeling core.

One basic idea of the invention is to use a wire reeler or a belt reeleras a reeler, the function of which is guided by adjusting severaldifferent parameters as a function of the diameter of the machine reeland/or the web speed and the paper grade that is being run. In thedescription the term belt reeler is used, said term referring both to abelt reeler and to a wire reeler. Correspondingly, the term wire is usedto refer both to the belt and to the wire.

The reeling process of the belt reeler can be adjusted, thus formingmachine reels of desired kind. The factors affecting the reeling includefor example web tension, wire tension, distance of the machine reel fromthe wire turning roll, depression of the wire/machine reel, surface drawand peripheral force. Preferably, parameters are adjusted as a functionof the diameter of the machine reel and/or the web speed and the papergrade that is being run. Advantageously, several parameters are adjustedsimultaneously, such as two, three, four, five or six aforementionedparameters. In addition to the aforementioned parameters, it is alsopossible to adjust other parameters.

The web tension is utilized to affect the tension of the machine reelstructure. The web tension is typically generated primarily by means ofa center drive. The contribution of the center drive in generating theweb tension is advantageously greater than that of the wire turning rollin use, so that a sufficiently tight machine reel can be formed. Thewire turning roll and/or the wire can also decelerate the speed incertain cases, wherein the entire web tension is drawn with the torqueof the center drive.

By means of the wire tension it is, in turn, possible to affect theforce transmitted between the wire and the surface of the machine reelto the machine reel. When the wire tension is increased, the forcetransmitted via the nip to the machine reel is also increased, if otherreeling parameters are kept constant. The tension of the wire isadjusted by means of actuators. The tension of the wire is typically inthe order of approximately 15 to 35 kN/m, depending on the forcerequired. The level of the force required is affected by severalfactors, such as paper grade, web speed, etc. When a stronger/lessflexible belt or for example even a metal wire or a belt is utilized,the wire tension can, of course, be greater than the above-mentionedtypical value.

The distance of the machine reel from the wire turning roll affects thelength of the nip formed by the wire and the surface of the machine reelwith constant depression. If the machine reel is located close to thewire turning roll, the nip becomes longer as the wire rises on thesurface of the turning roll in a sharper angle. If the aim is to keepthe length of the nip constant, the depression must be decreased whenthe machine reel is located close to the wire turning roll.

The depression of the wire/machine reel affects the surface area betweenthe wire and the machine reel, via which the nip force is transmitted tothe machine reel. When the depression increases, the surface area of thenip affecting the machine reel is increased, and the force effective perunit area, i.e. the nip pressure is even decreased. However, the totalforce effective through the nip is increased.

By means of surface draw it is possible to affect the tightness of themachine reel to be reeled. The surface draw is attained by producingtorque differences, for example by decelerating the wire by means of thedrive of the wire turning roll. The sum of the peripheral force and thetorque of the wire turning roll approximately equals the web tension(naturally reeling friction and other losses affect the equation). It isalso possible to perform the surface draw/deceleration by means of aseparate roll or a wire.

By means of the above-described control solutions it is possible toattain various significant advantages when compared to solutions ofprior art. Depending on the embodiment, it is possible to attain forexample one or several of the following advantages.

-   -   when the nip control of the belt reeler is implemented as        presented above, either the actual pressure exerted by the wire        on the reel or the parameter “equivalent linear load” comparable        to the conventional linear load is adjusted    -   the actual wire pressure against the machine reel or the        “equivalent linear load” is adjusted by affecting the actual        variables correlating with the primary function of the wire,        i.e. removal of air from the machine reel    -   when the torques of the drives and the deflection of the wire        are taken into account in the calculation, the actual wire        tension affecting the surface pressure/“equivalent linear load”        is adjusted    -   to control the wrap angle, it is possible to use two        complementary control variables (deflection of the wire and        distance of the reel from the first belt/wire guiding roll    -   in addition to the magnitude of the nip force it is also        possible to affect its orientation

The belt reeler whose function can be controlled, if necessary, byadjusting several different parameters as a function of the diameter ofthe machine reel and/or the web speed and the paper grade that is beingrun, can be implemented in various ways. In one embodiment the beltreeler is formed of a so-called pope reeler. The term pope reeler refersto a known reel-up of prior art in which the reeling core and thegrowing machine reel are not equipped with a center drive, but therotating torque is transmitted to the reel from the rotating movement ofthe reeling cylinder via the reeling nip. The pope reeler issupplemented with a wire and a press roll equipped with a drive. Thecontrol of the wire loop is easier with a longer wire loop, because ofwhich it is advantageous to use several rolls via which the wire loopcirculates. In said manner it is advantageously possible to form a beltreeler with a moving reeling nip and a stationary secondary reelingstation.

By means of such a reeler it is possible to form a so-called semi-hardnip (i.e. a nip comprising both a wire nip and a roll nip) for theduration of the entire reeling process. The wire nip enables removal ofair, which is an advantageous feature especially at high speeds. Thehard nip, in turn, is utilized to affect the hardness of the reel.

The reeler also enables fully supported web transfer to the reeler andeasy tail threading. The solution has an advantageous effect on theoverall structure, because it enables an advantageous positioning of thepulper and a low structure of the storage.

As to the modifications made in the reeler, the final way ofimplementing the belt reeler is substantially dependent on the originalreeler. For example an existing reel-up equipped with a center drive canbe formed into a belt reeler by using their reeling cylinder as a wireguiding roll, advantageously as a turning roll. In addition, a secondwire guiding roll and possibly other wire guiding rolls, as well as oneor several press rolls are required.

In one embodiment two stationary reeling frames are arranged for thereel spools. Between the reeling frames travels a supporting member loopthat forms a reeling nip and helps in taking the web from one reelingframe to another. The loop of the supporting member moves along with thediameter and adjusts the reeling nips according to the situation. Thechange is conducted by means of waterjet cutting change device, or thelike. In addition to this, pick-up i.e. lifting devices, such asgoosenecks may be required after each reeling frame, to bring the cutweb again on a new reel spool. After the first reeling frame, a holdingblow and/or a suction box may be required in the area of the tail cut bymeans of waterjet to prevent the tail from rising on the reel spool.

By means of such a reeler solution equipped with a stationary reelingframe it is possible to attain several advantages. Depending on theembodiment, it is possible to attain for example one or several of thefollowing advantages.

-   -   possible to implement with simple structures, such as storage        frames, wherein the structure is cheap and durable    -   storage with actuators not necessary    -   structurally more economical to couple a stationary drive, when        compared to a movable drive    -   no drive change with possible problems in the middle of the reel    -   no linear load change with possible problems in the middle of        the reel    -   possible press, change and other corresponding equipment easier        to implement/add, as it is not necessary for them to move along        with the reeling device    -   steady, does not vibrate    -   endures process disturbances and forces/strikes resulting        therefrom    -   second redundant station may produce full reels in one frame        while the other is being serviced, reliability improves    -   expandability, one embodiment can be supplemented with storages        for empty reel spools, etc.    -   stoppage times are shortened, because it is not always necessary        to remove the reel spool from the machine and in case of lack of        spool it is possible to bring the reel spool directly to the        reeling frame faster    -   transverse oscillation is easily accomplished in the machine        direction in stationary stations

The supporting member loop of the belt reeler, in turn, can be utilizedto attain for example one or several of the following advantages,depending on the embodiment

-   -   controlled transfer of a full-width web to a reeling station        possible    -   much easier to move the supporting member loop than the heavier        machine reel    -   accurate force measurement of the tension adjustment of the        supporting member loop,    -   facilitates the transfer of broke to the pulper and cleaning in        a web break

One embodiment, in turn, makes it possible to place reeling frames intwo layers, wherein it is possible to attain some of the followingadvantages:

-   -   low construction on the machine level, fits in a lower hall, no        problems when operating with a crane    -   easier to attain a safer reeler    -   same floor opening can be used as a lift hole which is usually        present in a mill,    -   the construction of the pulper is better/less expensive, low        structure, no long ramps, less need for water

The belt reeler and its control method can be used in various ways. In achange method a new reel spool is provided with an adhesive element onthe area remaining outside the wire, such as a double-sided adhesivetape, glue, etc. In a normal reeling situation the amount which thepaper web is detached from the reel spool in the area outside the edgeof the wire and from the adhesive surface of the reel spool correspondsto the thickness of the wire. The change is conducted for example bycutting a tail from a full-width web at the location of the adhesiveelement, for example from one edge of the web or from the middle. Thetail cut by means of waterjet is deflected towards the reel spool forexample by means of a movable member located after the nip, or by meansof a deflection element fed in said point in the nip, wherein the tailtouches the adhesive area and is attached thereto. The deflectionelement also enables the cutting of a wedge instead of a tail.

One change embodiment can also be utilized in conventional reelers. Inthe embodiment, an adhesive tape or a corresponding structure isinstalled in the area of a new reel spool outside the paper web. Thecutting of a tail from the edge of the web starts at the same time whenthe nip is closed. For example an adhesive tape activated under pressureis activated when the nip is closed, whereafter the narrow tail isdeflected in the lateral direction to the area of the adhesive area,wherein it adheres to the adhesive tape. The adherence of the tail tothe adhesive tape is followed by spreading. The method is especiallysuitable for slow paperboard machines, wherein when the adhesive surfacethat is thinner than the thick paperboard web to be reeled is locatedoutside the edge of the web in the reel spool, the adhesive surface doesnot touch the reeling cylinder when the nip is closed, but when the cuttail or the entire web is transferred transversely at the location ofthe adhesive surface, it touches the adhesive agent. By means of thischange method, it is possible to eliminate for example the slackness atthe bottom.

In the following, the invention will be described in more detail withreference to the appended principle drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 2 show a belt reeler and some of its parameters.

FIGS. 3 to 6 show in side views a belt reeler solution formed of aso-called pope reeler.

FIGS. 7 to 9 show side views of a belt reeler solution formed of acenter-driven reeler of prior art, in which the reeling cylinder hasbeen stationary.

FIGS. 10 to 12 show side views of another belt reeler solution formed ofanother kind of center-driven reeler of prior art, in which the reelingcylinder has originally been movable in the horizontal direction.

FIGS. 13 to 20 show side views of embodiments of belt reelers equippedwith two reeling frames.

FIG. 21 shows a belt reeler from above.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

For the sake of clarity, the figures only show the details necessary forunderstanding the invention. The structures and details that are notnecessary for understanding the invention, but are obvious for anyoneskilled in the art, have been omitted from the figures in order toemphasize the characteristics of the invention.

FIG. 1 shows in principle the structure of a belt reeler and a wirereeler. The reeler comprises at least a first wire guiding roll 1 and asecond wire guiding roll 2. Through the wire guiding rolls 1, 2 travelsan endless supporting member loop 3, which in the example is a wire or abelt. The reeler may also comprise larger number of rolls than the tworolls 1, 2 shown in the Figure. One or several rolls (so-called turningrolls) are rotated with a drive, which is advantageously adjustable. Thesolution according to FIG. 2 also comprises a wire guiding roll 8, viawhich the supporting member loop 3 travels, and a press roll 10. It isalso possible to implement other kind of solution by combining thefeatures of FIGS. 1 and 2 together. For example, the solution of FIG. 1can be supplemented either with a third wire guiding roll 8 or a pressroll 10.

FIGS. 1 and 2 also describe a reel 4 in a reeling stage. The reel 4 isformed by reeling a web 5 moving along the track around a reeling core6, i.e. in the example around a reel spool. In the example the reelspool 6 is also rotated with a center drive, which is advantageouslyadjustable.

The reeling process of the belt reeler can be adjusted in a controlledmanner, thus forming machine reels 4 of the desired kind. The parameterseffective in the reeling include the following parameters, shown inprinciple in FIG. 1:

-   web tension P1-   wire tension P2-   distance of the machine reel from the wire turning roll P3-   depression of the wire/machine reel P4-   surface draw P5, P5′, P5″-   peripheral force P6

To adjust the quality of the machine reel 4, the parameters P1 to P6 areadjusted for example as a function of the diameter of the reel and/orthe web speed and the paper grade that is being run.

The web tension P1 must be sufficient to attain optimal machine reelstructure 4. The web tension P1 is typically generated substantially bymeans of a center drive. The contribution of the center drive in thegeneration of web tension P1 is advantageously greater than that of thewire turning roll 3, so that it is possible to form a sufficiently tightmachine reel 4.

By means of the tension P2 of the wire 3 it is possible to affect theforce transmitted via the wire and the surface of the machine reel 4 tothe machine reel. When the tension P2 of the wire 3 is increased, theforce transmitted via the nip 7 to the machine reel 4 is also increased,if other reeling parameters are kept constant. The tension P2 of thewire 3 is adjusted by means of actuators. The tension P2 of the wire 3is typically in the order of approximately 15 to 35 kN/m, depending onthe force required. The level of the force required is affected byseveral factors, such as paper grade, web speed, etc.

During the run, the deflection and the tension P2 of the wire 3 can beadjusted in such a manner that the effective pressure exerted by thewire 3 on the reel 4 remains constant, or it is adjusted in accordancewith a desired “formula” as a function of the diameter of the reel. Theeffective pressure exerted by the wire 3 on the machine reel 4 is thetension of the wire P2 divided with the radius of the machine reel.

The “equivalent linear load” exerted by the wire 3 on the machine reel 4can be adjusted (effective pressure multiplied with the length of thenip) in accordance with a desired “formula” as a function of thediameter, or the “equivalent linear load” is kept constant. The lengthof the nip 7 is attained by multiplying the wrap angle of the wire 3with the radius of the machine reel 4. When this is reduced, theequivalent linear load is the wrap angle of the wire 3 multiplied withthe tension P2 of the wire.

The torque of the wire guiding roll or rolls 1, 2 and the drive of themachine reel 4, and advantageously also their bearing friction are takeninto account in the measurement, calculation and/or adjustment of thetension P2 of the wire 3. The torques and frictions either increase orreduce the tension of the wire 3 locally. Local change typically occurson both sides of the drawing or holding point. The torques and frictionsalso increase or reduce the deflection of the wire 3, i.e. the angle ofincidence and departure of the wire.

The distance P3 of the machine reel 4 from the turning roll of the wire3 affects the length of the nip 7 formed by the wire and the surface ofthe machine reel with constant depression (>0). If the machine reel 4 islocated close to the first wire guiding roll 1 of the wire 3, which inthe example is also a turning roll, the nip 7 becomes longer as the wirerises on the surface of the turning roll in a sharper angle. If the aimis to keep the length of the nip 7 constant, the depression P4 must bedecreased when the machine reel 4 is located close to the turning roll 1of the wire 3.

The depression P4 of the wire/machine reel affects the area between thewire 3 and the machine reel 4, via which the nip force is transmitted tothe machine reel. When the depression P4 increases, the area of the nip7 affecting the machine reel 4 is increased, and the force effective perunit area is decreased. However, the total force effective through thenip 7 increases.

The deflection P4 of the wire/machine reel can be affected for examplewhen the deflection of the wire 3 is calculated and adjusted on thebasis of the locations of the wire guiding rolls 1, 2, the reel spool 6and the diameter of the machine reel 4. The diameter of the machine reel4 is measured for example by means of an ultrasound, laser or other kindof sensor positioned in a primary and/or secondary reeling device 9. Thediameter of the machine reel 4 can also be determined by means ofcalculations on the basis of the web speed of the drives and the speedof rotation of the machine reel. The web speed can be determined bymeans of web speed calculation of electric drives, or directly forexample by measuring with a laser surface speed measuring device.

The depression P4 of the wire/machine reel can also be affected whencalculating and adjusting the deflection of the wire 3 on the basis ofthe locations of the wire guiding rolls 1, 2, and the reel spool 6. Thecalculation is based on the fact that when the length of the wire 3remains constant, the diameter of the reel 4 can be calculatedaccurately on the basis of the location data of the wire guiding rolls1, 2 and the reel spool 6.

The depression P4 of the wire/machine reel can also be affected byadjusting the “equivalent linear load” exerted by the wire 3 on themachine reel 4 (effective pressure multiplied with the length of the nip7) in accordance with a desired “formula” as a finction of the diameter,or the “equivalent linear load” is kept constant. The length of the nip7 is attained by multiplying the wrap angle of the wire with the radiusof the machine reel 4. When this is reduced, the equivalent linear loadis the wrap angle of the wire 3 multiplied with the tension P2 of thewire.

By means of surface draw P5 it is possible to affect the tightness ofthe machine reel 4 to be reeled. The surface draw P5 is advantageouslyproduced by decelerating the wire 3 by means of the drive of the wireturning roll. The difference of the deceleration produced by theperipheral force of the center drive and the wire turning roll is theweb tension P1.

According to FIG. 2, the surface draw P5′ can also be produced in such amanner that the machine reel 4 is positioned directly against the firstwire turning roll 1, i.e. the surface draw is not substantiallytransmitted via the wire. Thus, the distance P3 of the machine reel 4from the turning roll of the wire 3 is substantially zero, taking intoaccount the thickness of the wire positioned between the roll and themachine reel.

The surface draw P5″ can also be produced by means of a separate pressroll 10, as shown for example in FIG. 2. This alternative for a surfacedraw parameter is illustrated in FIG. 2 with the reference numeral P5″.Thus, it is possible to adjust the reel formation by means of thecombined effect of the surface draw P5 produced by the press roll 10 P5′and the wire 3, for example by means of the differences of the surfacedraws. By means of the difference of the surface draw torques (P5″ toP5) produced by the press roll 10 and the wire 3 it is possible tocontrol the tension of the reel 4 and attain a hard roll nip at the sametime, which advantageously increases the tightness of the reel whencompared to surface draw attained by the wire only.

In one embodiment it is also possible to produce the surface draw as acombined effect of the surface draw torques P5′ and P5″, i.e. theplacing of the machine reel directly against the first wire guiding roll1 produces the surface draw P5′ of this part, and additionally surfacedraw P5″ is produced by means of the press roll 10.

The torques of the drives are adjusted in the direction of resultantforce exerted by the wire 3 on the surface of the reel 4 in such amanner that it is optimal in view of the nip force and removal of air.

The wrap angle of the wire 3 is adjusted by the deflection of the wireand the distance P3 of the machine reel 4 from the first wire guidingroll 1. The distance P3 affects the angle of incidence and departure ofthe wire 3 from the nip 7, and thus the direction and magnitude of theresultant force of the machine reel.

FIGS. 3 to 6 show a reeler solution. The presented belt reeler is formedof a so-called pope reeler. The belt reeler comprises at least a firstwire guiding roll 1 and a second wire guiding roll 2. The reelingcylinder of the pope reeler has been converted into a first wire guidingroll 1 and advantageously into a turning roll. Furthermore, the popereeler has been supplemented with a second wire guiding roll 2, a wire 3and a wire guiding roll 8, which is advantageously equipped with adrive. Thus, it is advantageously possible to form a belt reeler with amoving reeling nip 7 and a stationary reeling station 9. The stationaryreeling station 9 may also be a moving carriage or the like.

By means of such a reeler it is possible to form a so-called semi-hardnip 7 for the duration of the entire reeling process. The semi-hard nip7 comprises both a wire nip and a roll nip. The wire nip 7 enablesremoval of air, which is an advantageous feature especially at highspeeds. The hard nip 7, in turn, is utilized to affect the hardness ofthe reel 4.

The reeler enables fully supported web transfer to the reeler. FIG. 3describes the initial situation of the reeling. The reel spool 6 isdriven by a primary carriage and the reel spool 6 is in touch with thefirst wire guiding roll 1 via a supporting belt loop 3. FIG. 3 shows thesecond wire guiding roll 2 in its first position, i.e. down in thefront. The tension of the supporting member loop 3 is adjusted with awire guiding roll 8. To guide the supporting loop 3, the apparatus mayalso comprise several wire guiding rolls. Furthermore, the figure showsa secondary reeling station 9 equipped with a drive, which isadvantageously stationary. The figure also shows a press roll 10 in thevicinity of the secondary reeling station 9, which can also functionduring the entire reeling process or part of the same, or it can be amere surface binding device during/after the reel change.

When the reeling is in progress the second wire guiding roll 2 isbrought into a second position i.e. up in the front, as shown in FIG. 4.Thus, the second wire guiding roll 2 is brought in contact with the reelspool 6 via the supporting belt loop 3. The wire guiding roll 8 isutilized to adjust the tension of the supporting member loop.

In FIG. 5 the reel spool 6 is positioned in the secondary reelingstation 9. The nip 7 is thus formed with a second wire guiding roll 2,which in the figure is positioned in its third position, i.e. up in theback. Typically the surface binding device 10 is brought in contact withthe surface of the reel 4 that is being formed.

As the reeling proceeds and the reel 4 to be formed grows, the secondwire guiding roll 2 is lowered down, as shown in FIG. 6. When the reel 4starts to reach its target size, the next reel spool 6 is brought incontact with the first wire guiding roll 1 by means of the primarycarriage drive for change purposes. When the change has taken place, thesecond wire guiding roll returns from the described fourth position toits first position, and further to the other above-described positionsas the reeling proceeds.

As can be seen in FIGS. 3 to 6, a nip 7 that comprises a wire nip and ahard nip is constantly in use in the presented embodiment. Often it iseasier to control the wire loop 3 with a longer wire loop. Thus, is itadvantageous to use several rolls via which the wire loop 3 circulates.The third wire guiding roll 8 is necessary also in that respect that thewire guiding roll 2 moves, and still the length of the wire 3 remainsthe same. Thus, the movement of the wire guiding roll 8 compensates thechange produced by the movement of the roll 2 in the length of the wireloop 3.

The presented solution makes it possible to change a conventional reelerinto a wire reeler in a simple manner. In the belt reeler it is possibleto use the above-described control methods to produce a reel 4 of adesired kind. Furthermore, in some embodiments the presented belt reelermakes an advantageous positioning of the pulper possible. Furthermore,the structure enables a low storage, because the up-and-down movement ofthe carriages performs the lowering of the reeling cores 6 in thestorage.

FIGS. 3 to 6 present a way of implementing a belt reeler. As to themodifications made in the reeler, the final way of implementing the beltreeler is substantially dependent on the original reeler. FIGS. 7 to 12show some other embodiments of implementing a belt reeler.

FIGS. 7 to 9 show a belt reeler formed of a so-called Optireel® reeler.The reeler comprises at least two wire guiding rolls 1, 2. The firstwire guiding roll 1 is stationary and in said embodiment it is thereeling cylinder of the original reeler, or a wire guiding roll replacedin the corresponding position. The wire guiding roll 2 of the example isarranged movable. Depending on the application, there may also be alarger number of rolls. The moving wire guiding roll 2 is utilized tocontrol for example some parameters of the supporting belt, such as thetension P2 and depression P4 of the wire.

FIG. 7 shows a situation in which the formation of the reel 4 around anew reel spool 6 is started. The figure also shows the reel 4 that isbeing formed. As can be seen in the figure, the nip 7 of the reel 4 thatis being formed is essentially a wire nip. The nip 7 of the reel 4 thatis being started is, in turn, substantially a hard nip formed with aroll-wire combination 1, 3 by means of which a sufficiently tight reelbottom is attained.

As the reeling proceeds, the reel 4 that is being formed is transferredalong a supporting belt loop 3 towards the other end of the wire reeler,in which the second wire guiding roll 2 is located. This situation isshown in FIGS. 8 and 9.

In the example shown in FIGS. 7 to 9 the web 5 to be reeled is passed tothe reeler substantially horizontally. In some reeler embodiments, thepassing of the web 5 can occur from another direction. For example inthe embodiment shown in FIGS. 10 to 12 the web 5 is passed to the reelersubstantially vertically. FIGS. 10 to 12 show in principle a belt reelerdeviating from the preceding embodiment. Such a reeler can be formed forexample of a center-driven reeler of prior art, in which the reelingcylinder has originally moved in the horizontal direction. Thus, for alarge part of the reeling time the reel spool 6 can be stationary, whilethe reeling cylinder moves as the reeling proceeds. The web 5 is broughtto the reeler advantageously in the vertical direction, so that theeffect of the web tension P1 on the horizontal movement of the wireguiding roll 1 and on the horizontal nip load measured from its loadingmembers would be as small as possible.

The reeler shown in FIGS. 10 to 12 comprises at least two wire guidingrolls 1, 2. The first wire guiding roll 1 is arranged to movesubstantially horizontally, and in said embodiment it is the reelingcylinder of the original reeler, or a new wire guiding roll replaced ina corresponding position. If necessary, the wire guiding roll 1 can belocked so that it moves in a fixed position continuously or for sometime. The wire guiding roll 2 of the example is arranged movable.Depending on the embodiment, there may also be several rolls, and inview of the use, it is often advisable to use for example four, five orsix rolls. One or several moving wire guiding rolls 2 are utilized tocontrol for example some parameters of the supporting member loop, suchas the tension P2 and depression P4 of the wire.

FIG. 10 shows a situation in which the formation of a reel 4 around anew reel spool 6 is started. The figure also shows the reel 4 that isbeing formed. As can be seen in the figure, the nip 7 of the reel 4 thatis being formed is essentially a wire nip. The nip 7 of the reel 4 thatis being started is, in turn, substantially a hard nip formed by aroll-wire combination 1, 3.

As the reeling proceeds, the reel 4 that is being formed is transferredalong a supporting belt loop 3 towards the other end of the wire reeler,in which the second wire guiding roll 2 is located. This situation isshown in FIGS. 11 and 12. In one embodiment, the reel 4 that is beingformed may remain in its place from the beginning of the reeling almostuntil the end of the reel formation, wherein the supporting member loop3 or at least its first roll 1 is transferred according to the growth ofthe reel, for example horizontally to the left. The actuators can beactuators used for moving the reeling cylinder of an original prior artreeler, such as horizontal guides and loading cylinders. As long as thereeling takes place against the roll 1 with a hard nip, the nip load ofthe nip 7 can be determined at least partly from sensors connected tothe actuators of the roll 1, such as force sensors and pressure sensorsof the hydraulic cylinder. In the situation of FIG. 11, the nip load canbe determined in addition to the loading measurement of the roll 1 onthe basis of the tension/depression P2, P4 of the wire and/or as acombination of the measurements.

In the above-presented belt reeler solutions relating to FIGS. 7 to 12,the position of the reel spool 6 is arranged movable at least in somestage of the reeling. It is also possible to implement the belt reelerin such a manner that the reel spool 6 that is being formed rotates inits place during the reeling process.

FIGS. 13 and 14 show a reeler solution comprising two stationary reelingstations 11, 12, such as reeling frames, for reel spools 6. Between thereeling stations 11, 12 travels a supporting member loop of the beltreeler 3 that forms a reeling nip 7 and helps in taking the web from onereeling station 11, 12 to another. The supporting member loop 3 of thereeler moves along with the diameter of the reel 4 and both opens and/orcloses the reeling nips according to the situation. In FIG. 13 the firstreel 4 is being completed in the second reeling frames 12, and theformation of the new reel is being transferred to the first reelingframes 11. In FIG. 14, in turn, the reel has been completed in the firstreeling frames 11 and the new reel is reeled in the second station 12.

The reeler comprises at least a first wire guiding roll 1 and a secondwire guiding roll 2. Depending on the embodiment, there may also beseveral rolls, and in view of the use, it is often advisable to use forexample four, five or six rolls. In the embodiment of FIGS. 15 and 16,there are for example three rolls that are arranged movable. In FIG. 15the first reel 4 is being completed in the second reeling station 12,and the formation of a new reel is being transferred to the firstreeling frames 11. In FIG. 16, in turn, the reel has been completed inthe first reeling frames 11 and the new reel is reeled in the secondstation 12.

The reeling stations (reeling frames) 11, 12 can also be positioned ondifferent heights with respect to each other, as shown in FIGS. 17 to20. In FIGS. 17 and 18 the supporting member loop 3 travels via two wireguiding rolls 1, 2 and in FIGS. 19 and 20 via several rolls. By means ofseveral rolls it is possible to attain easier control of the wire 3. InFIGS. 17 and 19 the first reel 4 is being completed in the secondreeling station 12, and the formation of a new reel is being transferredto the first reeling frames 11. In FIGS. 18 and 20, in turn, the reel 4has been completed in the first reeling frames 11 and a new reel isbeing reeled in the second station 12.

In FIGS. 13 to 20 the tail threading in connection with belt reelerstakes place advantageously in a similar manner as in current reelers.The empty reel spool 6 can be located in either reeling frame 11, 12. Inthe tail threading the tail of the web 5 is passed and spread in fullwidth. Thereafter the tip of a wedge is cut and the end of the web 5 isblown around a reel spool 6 located either in the first 11 or in thesecond reeling frame 12 for example by means of a gooseneck or the like.The tip of the wedge can be cut with a suitable device, such as awaterjet cutting change device.

When the reeling is in progress, the reeling frame 11, 12 used in thereeling must be changed when the reel 4 has been completed. When thefull machine reel 4 is positioned in the latter reeling frame 12, thetip of the wedge is cut in the change with the waterjet cutting changedevice. The tip of the wedge is blown on an empty reel spool 6 locatedin the first reeling frame 11. Thus, it is possible to operatesubstantially in a similar manner as in tail threading or in changescurrently conducted by means of a waterjet cutting change device.

When the full machine reel 4, in turn, is positioned in the firstreeling frame 11, the tip of the wedge is cut off in the change by meansof the waterjet cutting change device. The tip of the wedge is preventedfrom turning with the web 5 on the surface of the machine reel 4 that isbeing formed. For this it is possible to use for example suctionunderneath the wire 3 or preventive blowing on top of the wire. Thus,the tip of the wedge continues its travel along the surface of thesupporting member loop 3 to the second reeling frame 12. When the web 5has passed the reel spool 6 in the second reeling frame 12, the waterjetcutting change device performs a cutting all the way to the edges, andthe web 5 is blown around the reel spool 6 in the second reeling frame.

In connection with the belt reeler it is possible to use the followingchange method. FIG. 21 shows in a top view a belt reeler comprising afirst wire guiding roll 1 and a second wire guiding roll 2 through whichthe wire 3 travels. In the figure, the wire 3 is shown in broken lines,because the paper web 5 that is wider than the wire has been positionedon top of the wire 3, traveling through the nip 7 between the wire andthe reel spool 6. In the change method the new reel spool 6 is providedwith an adhesive element 13 in the area remaining outside the wire/wires3. The adhesive element 13 can be formed in various ways, for example bymeans of a double-sided adhesive tape, by spraying of glue, etc. Thechange is conducted by cutting a tail in the cross direction at thelocation of the adhesive element 13 (for example from one edge of theweb or from the middle). The tail cut by means of waterjet is deflectedtowards the reel spool 6 for example by means of a movable member 14located after the nip 7, or by means of a deflection element fed in saidpoint in the nip 7. The deflection element also makes the cutting of awedge instead of a tail possible. At the same time when the tail/wedgeadheres on the adhesive element 13 in the reel spool 6, the spreading ofthe web on the reel spool begins (spreading of cutting devices 15).

In view of reel formation, i.e. especially the straightness of the nipit is advantageous that the wire 3 is not larger in width, that it isadvantageously narrower than the web 5 from which the reel 4 is formed.Thus it is easy to arrange the adhesive element 13 at the edge of thereel spool 6 without said adhesive element adhering to the wire 3.

In cases where the change is conducted in the middle of the web 5, aspace is arranged in the middle of the reeler at the location of theadhesive element 13, because it is advantageous to have the adhesiveelement 13 in such a location where the wire is not present. The beltreeler that comprises two or several wires 3, the space between thewires may be formed only for the duration of the change by deviating oneor several wires sideways.

During the change the controlled detachment of the tail from the reelspool 6 can be ensured by means of a suitable solution. One suchsolution is a so-called tail-shooter blowing plate that keeps the taildown. The purpose of the solution is to ensure that the floating web 5does not accidentally adhere to the adhesive element 13 too early. Thisis possible especially when the distance between the adhesive element 13from the web 5 before the change is small, for example not larger thanthe thickness of the wire 3, or smaller. The distance is also affectedby the thickness of the adhesive element 13 and the shape of the coatingof the reel spool 6, which can be for example narrower at the ends.

One change embodiment can also be utilized in conventional reelers. Inthe embodiment, an adhesive element 13, such as an adhesive tape,pressure-activated adhesive tape or a corresponding structure isinstalled in the reel spool 6, in an area outside the paper web. Thepressure-activated adhesive tape is activated when the nip 7 is closedand the adhesive tape is subjected to pressure. By placing the adhesiveelement 13 outside the web it is possible to efficiently prevent theadhesive element and the web from adhering to each other prematurely,wherein the change can be timed for example in the waterjet cuttingchange. The cutting of a tail from the edge of the web starts at thesame time when the nip 7 is closed. Thereafter the narrow tail isdeviated in the lateral direction at the location of the adhesive area13, wherein it adheres to the adhesive agent. The adherence of the tailto the adhesive agent is followed by spreading. The method is suitableespecially for slow paperboard machines and for solutions in which thewire 3 is not narrower than the web.

For example when a thick paperboard web is being reeled and the adhesiveelement 13 that is narrower than the web to be reeled 5 is located inthe reel spool 6 outside the edge of the web, the adhesive element 13does not touch the reeling cylinder 1 when the nip 7 is closed. It isnot until the cut tail or the entire web 5 is transferred in thecross-direction at the location of the adhesive element 13 that ittouches the adhesive agent and performs a change.

The reeler used for the change comprises several different structuresand parts. The final configuration depends on the application and thepurpose of use of the device. The device can for example contain a tailcutting device.

By combining, in various ways, the modes and structures disclosed inconnection with the different embodiments of the invention presentedabove, it is possible to produce various embodiments of the invention inaccordance with the spirit of the invention. Therefore, theabove-presented examples must not be interpreted as restrictive to theinvention, but the embodiments of the invention may be freely variedwithin the scope of the inventive features presented in the claimshereinbelow.

1. A method in a belt reeler in which a reeling nip is formed by areeling core or a growing machine reel and at least one endlesssupporting member traveling at least via a first wire guiding roll and asecond wire guiding roll, wherein several parameters are determined andadjusted simultaneously to adjust the reeling process, of whichparameters at least the first parameter and the second parameter are oneof the following: web tension, wire tension, distance of the machinereel from the wire turning roll, depression of the wire/machine reel,surface draw, peripheral force.
 2. The method according to claim 1,wherein the parameter is determined by means of measurements orcalculations.
 3. The method according to claim 1, wherein the beltreeler is formed of a center-driven reeler by replacing its reelingcylinder with a first wire guiding roll and adding at least a secondwire guiding roll, and an endless supporting member.
 4. The methodaccording to claim 1, wherein the belt reeler is arranged in a reelingapparatus comprising at least two stationary reeling stations to form amachine reel.
 5. The method according to claim 4, wherein the first wireguiding roll and the second wire guiding roll are arranged to move inrelation to the reeling stations.
 6. The method according to claim 1,wherein the area of the reeling core outside the paper web and/or thewire is provided with an adhesive element against which a section of thepaper web is guided when changing the reeling core.
 7. A belt reeler inwhich a reeling nip is formed by a reeling core or a growing machinereel and at least one endless supporting member arranged to travel atleast via a first wire guiding roll and a second wire guiding roll,wherein the belt reeler comprises at least means for determining andadjusting several parameters simultaneously to adjust the reelingprocess, of which parameters at least the first parameter and the secondparameter are one of the following: web tension, wire tension, distanceof the machine reel from the wire turning roll, depression of thewire/machine reel, surface draw, peripheral force.
 8. The belt reeleraccording to claim 7, wherein the belt reeler is formed of acenter-driven reeler by replacing its reeling cylinder with a first wireguiding roll and adding at least a second wire guiding roll, and anendless supporting member.
 9. The belt reeler according to claim 7,wherein the belt reeler is located in a reeling apparatus comprising atleast two stationary reeling stations to form a machine reel.
 10. Thebelt reeler according to claim 9, wherein the first wire guiding rolland the second wire guiding roll are arranged to move in relation to thereeling stations.
 11. A method for rebuilding a center-driven reeler,said reeler comprising at least a reeling cylinder, wherein thecenter-driven reeler is formed into a belt reeler by replacing itsreeling cylinder with a first wire guiding roll and adding at least asecond wire guiding roll, and an endless supporting member.
 12. Areeling apparatus comprising at least a belt reeler in which a reelingnip is formed by a reeling core or a growing machine reel and at leastone endless supporting member arranged to travel at least via a firstwire guiding roll and a second wire guiding roll, wherein the beltreeler comprises at least two stationary reeling stations to form amachine reel.
 13. The belt reeler according to claim 12, wherein thefirst wire guiding roll and the second wire guiding roll are arranged tomove in relation to the reeling stations.
 14. A reel change method to beused in a belt reeler in which a reeling nip is formed by a reeling coreor a growing machine reel and at least one endless supporting membertravelling at least via a first wire guiding roll and a second wireguiding roll, wherein the reeling core is provided with an adhesiveelement located in such an area in the reeling core which at least inthe beginning of the reeling process remains outside the reeling nip, towhich adhesive element a section of the paper web is guided whenchanging the reeling core.
 15. The method according to claim 14, whereinthe adhesive element is located at the end of the reeling core.
 16. Themethod according to claim 14, wherein the adhesive element is formed byspraying of glue or by means of an adhesive tape.